Gas-blast circuit breaker with multiple break



H. THOMMEN 2,824,196

GAS-BLAST CIRCUIT BREAKER WITH MULTIPLE BREAK Feb. 18, 1958 5 Sheets-Sheet 1 Filed Feb. 15, 1956 Feb. 18, 1958 H. THQMMEN 2,824,195

GAS-BLAST CIRCUIT BREAKER WITH MULTIPLE BREAK Filed Feb. 15, 1956 5 Sheets-Sheet 2 I I W! lllllllllll -Il'lllllli! H. THOMMEN Feb. 18, 1958 GAS-BLAST CIRCUIT BREAKER WITH MULTIPLE BREAK Filed Feb. 15, 1956 3 Sheets-Sheet 3 fir 8 m m m m m m M W United States Patent F GAS-BLAST CIRCUIT BREAKER MULTIPLE BREAK Hans Thomrnen, Baden, Switzerland, assignor to Aktiensss l sch fi B ow Bcv ri & Ci Baden, Switzerland, s h nttash ss rary In gas-blast circuit breakers there are very often connected in series a, switch for the disengagement of the service and an'isolating disconnect switch for the voltage isola 'on. In switches with multiple break it has proved advantageous to provide, as far as possible, as many disconnect switch contacts as service switch contact s. This requires an enlargement of the over-all length ofthe switch unless special measures are taken. Therefore, it has been proposed to arrange the various switchcontacts at an angle rather than colin early. Thus, the over-all height or overall length is minimized. However, there are ditiicultie s in the regulation of the drive for the disconnect switch contacts. Hence, there are required more switch contacts for the power supply which accordingly increases the power requirements for the switch operation of the voltage disconnect switch.

When the gas-blast circuit breakers with multiple break are wet vithpatticslat im ed n ber or the governing of the voltage distribution through the particua e s tc canteen as s saaacitance o ohmic resistances, an improvement in the arrangement of the t i'can a qtqi atq he n ent on. be h ev in a simple way in that the parallel impedances are structural parts suitable for the manipulation of the disconnect switch contacts.

For this purpose, the driving shaft for the manipulation of the voltage insulation point can be led through the hollow insulator, constructed as a capacitor. The driving length may be further diminished, when the capacitances and the service switch contacts are mutually arranged in an inclined relationship and the disconnect switch contacts are installed therebetween.

Instead of the capacitors it is also possible to use as a drive element the ohmic resistors provided for voltage regulation. A further simplification and material savings can be attained in that the insulators serving as parallel resistances are rotatably secured to the shaft for use as driving shafts for the disconnect switch contacts.-

Moreover, it is suitable to drive several, or all, of the disconnect switches by one common shaft. In this case there must be available linkages between the disconnect switch contacts which according to the invention must be led through the structural parts which serve as potential regulators.

As is known, the motive power for the disconnect switch contacts can readily be effected by compressed air. In this case it is possible to construct the supply line of compressed air for the service switch contacts and the disconnect switch contacts in a common main, and to divide the air main in close proximity to said points. Thus the feeding line becomes very short and passes, according to the invention, through the structural parts used for voltage regulation. Since the disconnect switch contacts may be manipulated only after complete disengagement of the service through the service switch contacts, the operation of the valve installed therefor must be delayed as compared with the operation of the valve for the service switch contacts. This delay must be suffi- 2,824,196 Patented Feb. 18, 1958 2 ciently great to open, the disconnect switch contacts during the application of the switch for the short disengagement (quick reclose) when the definite disengagement is completed.

A further diminution of the over-all length can also bc a ta nc i thatth arc ng is an es of the disconnec switch contacts are made only large enough to stand a voltage just slightly higher than that corresponding to the no mal op rating vcl age- Thus, for example. if ther a e a ailab e. voltage. insula n p s, the volt- 38. ShOhldv be Sl ghtly her than one-S t f h pert s ag on the switch.

Figs. l;5 present practical examples of the inventive concept, Fig. 1 shows a gas-blast circuit breaker with air-blastinterrnpter units 1 and six voltage disconnect switches 2 (see also Fig. 4). 3, designates a hollow control condenser, through which there is led a driving, shaft 4 by way of gear 5. to adisconnect switch 2. The driving shaft 4 is driven by way of a further shift gear 6 by a, drivi11g. shaft 7 which is actuated outside of the switch by compressed. air, driving motor or manually by acrank handle- The compressed air needed for the actuation of the air-blast interrupter unit 1 is taken, in known way, from a compressed: air tank 8 and supplied to the explosion chamber through a pin insulator 9. The airblast interrupter unit 1 and a capacitance 3 are disposed in mutual angular. position, so that the arrangement of the disconnect switch. 2 affects only slightly the over-all length of the switch. The. control resistances are designated at 10; in this example they are not connected with the motive power.

In Fig. 2 there is constructed, a rotary insulator 3 which serves as condenserand thus becomes a part of the motive power. The same is rotated by the driving shaft 7 by way of a bell crank 6. The break jack of the disconnect switch 2 is. connected with. the control condenser 3 so that the break jack comes out when the control capacitance is rotated.

Fig. 3 shows another example wherein the ohmic resistances 10 are used for the drive of the disconnect switch 2. The air-blast interrupter unit 1 is arranged horizontally in this case. The condenser 3 is positioned in parallel thereto, separated by a pin insulator 11. Both are connected together by way of the disconnect switch 2. This latter is actuated by means of a shift-gear 12 with the help of the ohmic resistance.

Fig. 4 shows another arrangement wherein all the disconnect switches are driven by means of a common shaft 13; coupling rods 14 extend through hollow capacitors 3 to simultaneously operate all of the disconnect switches.

Fig. 5 shows an arrangement wherein the supply line of the compressed air for the disconnect switches is common to compressed air supply for the air-blast interrupter units. Thus, the voltage insulation points are, in this case, actuated by compressed air. In close proximity there are arranged valves 14 and 15. The valve 14 serves to control the actuation of the air-blast interrupter unit while valve 15 effects the actuation of the disconnect switch which is provided with a retarding device 16.

I claim:

1. In a multiple-break gas-blast circuit breaker having stationary air-blast interrupter units with rotatably movable structural impedance units electrically connected in parallel thereto and isolating disconnect switches electrically connected in series therewith, the invention comprising actuating means for opening the disconnect switches, said actuating means including said rotatably movable structural impedance units.

2. A multiple-break gas-blast circuit breaker comprising a plurality of stationary air-blast interrupter units, structural impedance units electrically connected in parallel with said interrupter units, said impedance units including control capacitors rotatably arranged at acute angles with respect to said air-blast interrupter units, isolating disconnect switches arranged between non-adjacent ends of said air-blast interrupter units and said control capacitors and being electrically connected in series with said air-blast interrupter units, means connect- I ing said rotatable control capacitors to said disconnect switches to cause said disconnect switches to open upon rotation of said capacitors, and means for rotating said capacitors.

3. A multiple-break gas-blast circuit'breaker comprising a plurality of stationary air-blast interrupter units, structural impedance units electrically connected in parallel with said interrupter units, said impedance units including resistors rotatably arranged substantially parallel to the air-blast interrupter units, isolating disconnect switches electrically connected in series with said interrupter units, means connecting said rotatable resistors to said disconnect switches to cause said disconnect switches to open upon rotation of said resistors, and means for rotating said resistors.

4. A gas-blast circuit breaker as defined in claim 1 wherein the disconnect switches are arranged to operate at a potential only slightly above the normal operating voltage.

5. A gas-blast circuit breaker comprising a stationary,

air-blast interrupter unit, a rotatably movable structural impedance unit electrically connected in parallel to said interrupter unit, anisolating disconnect switch electrically connected in series with said interrupter unit, and actuating means including said rotatably movable structural impedance unit for opening said disconnect switch.

6. A multiple-break gas-blast circuit breaker comprising a plurality of air-blast interrupter units, a plurality of impedance units electrically connected in parallel thereto, at least one of said impedance units being structurally hollow, isolating disconnect switches electrically connected in series with said interrupter units, valve means in said hollow impedance units for opening said disconnect switches, means for supplying compressed air from a common source to operate said interrupter units and to said hollow impedance units to operate said valve means, and means within said hollow impedance units for delaying the operation of the valves therein subsequent to the operation of said air-blast interrupter units.

7. A multiple-break gas-blast circuit breaker comprising a plurality of air-blast interrupter units, structural impedance units electrically connected in parallel to said interrupter units, said impedance units including hollow control capacitors arranged at acute angles with respect to said'air-blastinterrupter units, isolating disconnect switches electrically connected in series with said interrupter units, and means including a drive shaft extending through said hollow capacitors for opening said disconnect switches. i l

8. A multiple-break gas-blast circuit breaker comprising a plurality of vertical pin insulators mounted upon a support, each of said pin insulators having a plurality of air-blastinterrupterunits mounted thereon, structural impedance units electrically connected in parallel to said interrupter units, said impedance units including a plu- 'rality of colinearly arranged hollow control capacitors each arranged at an acute angle with respect to its associated air-blast interrupter unit, isolating disconnect switches electrically connected in series with said interrupter units, and means including a single drive shaft exextending through each of said hollow capacitors for opening all of said disconnect switches.

References Cited in the file of this patent UNITED STATES PATENTS 

